/*

 * jinclude.h

 *

 * Copyright (C) 1991-1994, Thomas G. Lane.

 * This file is part of the Independent JPEG Group's software.

 * For conditions of distribution and use, see the accompanying README file.

 *

 * This file exists to provide a single place to fix any problems with

 * including the wrong system include files.  (Common problems are taken

 * care of by the standard jconfig symbols, but on really weird systems

 * you may have to edit this file.)

 *

 * NOTE: this file is NOT intended to be included by applications using the

 * JPEG library.  Most applications need only include jpeglib.h.

 */





/* Include auto-config file to find out which system include files we need. */



#include "jconfig.h"		/* auto configuration options */

#define JCONFIG_INCLUDED	/* so that jpeglib.h doesn't do it again */



/*

 * We need the NULL macro and size_t typedef.

 * On an ANSI-conforming system it is sufficient to include <stddef.h>.

 * Otherwise, we get them from <stdlib.h> or <stdio.h>; we may have to

 * pull in <sys/types.h> as well.

 * Note that the core JPEG library does not require <stdio.h>;

 * only the default error handler and data source/destination modules do.

 * But we must pull it in because of the references to FILE in jpeglib.h.

 * You can remove those references if you want to compile without <stdio.h>.

 */



#ifdef HAVE_STDDEF_H

#include <stddef.h>

#endif



#ifdef HAVE_STDLIB_H

#include <stdlib.h>

#endif



#ifdef NEED_SYS_TYPES_H

#include <sys/types.h>

#endif



#include <stdio.h>



/*

 * We need memory copying and zeroing functions, plus strncpy().

 * ANSI and System V implementations declare these in <string.h>.

 * BSD doesn't have the mem() functions, but it does have bcopy()/bzero().

 * Some systems may declare memset and memcpy in <memory.h>.

 *

 * NOTE: we assume the size parameters to these functions are of type size_t.

 * Change the casts in these macros if not!

 */



#ifdef NEED_BSD_STRINGS



#include <strings.h>

#define MEMZERO(target,size)	bzero((void *)(target), (size_t)(size))

#define MEMCOPY(dest,src,size)	bcopy((const void *)(src), (void *)(dest), (size_t)(size))



#else /* not BSD, assume ANSI/SysV string lib */



#include <string.h>

#define MEMZERO(target,size)	memset((void *)(target), 0, (size_t)(size))

#define MEMCOPY(dest,src,size)	memcpy((void *)(dest), (const void *)(src), (size_t)(size))



#endif



/*

 * In ANSI C, and indeed any rational implementation, size_t is also the

 * type returned by sizeof().  However, it seems there are some irrational

 * implementations out there, in which sizeof() returns an int even though

 * size_t is defined as long or unsigned long.  To ensure consistent results

 * we always use this SIZEOF() macro in place of using sizeof() directly.

 */



#define SIZEOF(object)	((size_t) sizeof(object))



/*

 * The modules that use fread() and fwrite() always invoke them through

 * these macros.  On some systems you may need to twiddle the argument casts.

 * CAUTION: argument order is different from underlying functions!

 */



#define JFREAD(file,buf,sizeofbuf)  \

  ((size_t) fread((void *) (buf), (size_t) 1, (size_t) (sizeofbuf), (file)))

#define JFWRITE(file,buf,sizeofbuf)  \

  ((size_t) fwrite((const void *) (buf), (size_t) 1, (size_t) (sizeofbuf), (file)))

